L78M12CV (L7812CV) TO-220 Linear Voltage Regulator

The L78M12CV is a
three-terminal positive Voltage Regulator with several fixed output
voltages, making it useful in a wide range of applications. This
regulator can provide local on-card regulation, eliminating the
distribution problems associated with single point regulation. Each type
employs internal current limiting, thermal shutdown and safe area
protection, resulting it essentially indestructible. If adequate heat
sinking is provided, they can deliver over 0.5A output current. Although
designed primarily as fixed voltage regulators, these devices can be
used with external components to obtain adjustable voltage and currents.